问题补充:
I think going swimming in my spare time, I think is great fun and good exercise as well as a useful skill.
A. which
B. as
C. that
D. what
答案:
(答案→)A. which
B. as
C. that
D. what
解析:定语从句考查题。先行词为整个主句之意关系词which在从句中做主语。句意:我认为业余时间游泳是一件有意思的事情既是锻炼又是技能的培养。